Toán Lớp 8: Rút Gọn bảy hàng thức đáng nhớ
a)(x+y)^2+(x-y)^2
b)2(x+y)(x-y)+(x-y)^2+(x+y)^2
c)2(x+3)^2-3(x+1/2)^2+(x-4)^2
d) 126y^3+(x-5y)(x^2+5xy+25y^2)
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Toán Lớp 8: Rút Gọn bảy hàng thức đáng nhớ
a)(x+y)^2+(x-y)^2
b)2(x+y)(x-y)+(x-y)^2+(x+y)^2
c)2(x+3)^2-3(x+1/2)^2+(x-4)^2
d) 126y^3+(x-5y)(x^2+5xy+25y^2)
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